Process of manufacturing dental plates.



No. 784,060. PATENTED MAR. 7, 1905. J. P. MATHBRET.

PRUUESS OF MANUFACTURING DENTAL PLATES.

APPLICATION FILED AUG. 16. 1904.

UNITED STATES Patented March '7, 1905.

PATENT OFFICE.

JEAN PROSPER MATHERET, OF PARIS, FRANCE.

V SPECIFICATION forming part of Letters Patent No. 784,060, dated March '7, 1905. Application filed August 16, 1904:- Serial No, 220,934.

To all whom it may concern.-

Be it known that I, JEAN PROSPER MATHE- R ET, a citizen of the Republic of France, residing at 8 Rue de Valois, Paris, France, have invented new and useful Improvements in Processes for the Manufacture of Dental Plates, of which the following is a specification.

This invention relates to an improved process for the manufacture of dental plates.

In the accompanying drawings, Figure 1 is a perspective view of the plaster cast; Fig. 2, a perspective view of the first matrix; Fig. 3, a perspective view of the second matrix. Fig. 4C is a sectional view of the first matrix and one of the plungers with the gold foil between them. Fig. 5 is a view of the finished plate.

A first impression of the jaw is taken with wax. On this wax a plaster cast, Fig. 1, is molded, and by means of the latter two matrices are produceda first matrix of cast iron or steel, Fig. 2, the inequalities of which are made to disappear by chasing; a second controlling-matrix, Fig. 3, obtained by the galvanoplastic process. The latter process furnishes a copper sheet which reproduces exactly the plaster cast and which is rendered solid by means of a zinc filling. By means of these two matrices employed consecutively the dental plate is obtained. To this purpose the gold foil A is swaged at lirst in the matrix B, of cast iron or steel, Fig. 4, by means of three consecutive pluggers C of increasing hardness made with the aid of the same matrix. A first plugger of lead is obtained by swaging a mass of lead in the cast-iron matrix, and the gold plate is swaged in the same matrix with the aid of said first plugger. A

copper sheet is then placed into this matrix and molded on the first lead plugger, there being thus obtained a copper-covered lead plugger, with which the gold plate is swaged a second time in the matrix of cast-iron. Finally, a third plugger is made entirely of copper by means of swagingin the matrix of cast iron or steel a mass of copper heated to white heat. The gold plate is swaged by means of the third plugger at first in the first matrix and then inthe controlling-matrix obtained by the galvanoplastic method. A dental plate fl), Fig. 5, is thus obtained which is an exact reproduction of the plaster cast molded with the wax impression taken on the jaw.

What I claim is- The improved process for the manufacture of dental plates, which consists in first making by means of a plaster mold made from the Wax impression taken from the mouth, two matrices, one by casting cast iron or steel around the plaster, and the other by means of electro-deposition, the electro-deposited matrix being strengthened externally by means of a filling or backing of zinc or other material; thcn striking a gold plate successively in the two matrices by meansof consecutive dies of increasing hardness produced by casting or striking masses of lead and copper or other metals in the cast iron or steel matrix, snbstantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JEAN PROSPER MATHERET.

Witnesses:

EMILE BERT, HANSON C. Ooxn. 

